Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e064d6d8c495a48c1397efa0c01f9e6df07cba941b9ac527733e3d3010af2e6' 
  AND token = 'eDJp/49uvpHJp0oiLJrlrziaQ4IkMeTLVU+QOoLOsWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}