Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1091017e7288f77b7a9e81b49ffe9f7255d17f2d2371c0c3c5c0bc1dce33493f' 
  AND token = 'Lm4Fv4A1zcxpBvaNLyOkNsm6dB1Q+kvUZsgCaoXL/5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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