Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f0ccc4dc52d403933af2c34c7b20ac77d1a06771bca73fb357c131ddeefa7d' 
  AND token = 'gnE5Wqncq5jDypTSBRTC+frYM9kEymIgCG1GcAOO8lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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