Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7b4397244c6ebd1182730e1d0417634159beb5d8344437664a2d6012205911' 
  AND token = 'iRPevC2cbleqdZVy+dJW4UcZh/LpzWfM9Udwna2d4rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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