Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f387fb03cbf9df3d4b97c9017baa9e251b606faf6384791e76a14318a82754ae' 
  AND token = 'R9WTTVlTTFWs8bR0wV6G+jDQEzX8KaDDCZ8HOi9wEDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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