Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f392d1c9009f98bf530e9aa953c0a284eaa211d6e78e1766b069a74f484fe3ce' 
  AND token = 'ZdGvYfjVpSjEyxjQwpfpBhMKr4yvrvPtofQ5zRPBa9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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