Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab49ec371dca2c8a6d465c523b85daf6df077213eb3dad03e6d3539bba73ccab' 
  AND token = 'jwXp5EfoduJ0qr1QvVDiNLQ4XEqR/Iaamg7B6zo3aAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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