Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1f6a5c7d7d1387de4cc33dbfd98000e22f9e8ea8d0ad873e6569fda19701b8' 
  AND token = 'af/T0V6AuU7/Po0MPvdAWtJkFEMxyzauT/P+1ClDFgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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