Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8754791f15b744efd9a23ee8d6ea26944a2bf479f51b5b50c204ba0e0701a1e' 
  AND token = 'CXUQ9KAk3NwpLR+u0eBsFxqXfmESGPZltv6L64BUmak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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