Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e185bc9e133aed1851e2875e3ce9fdc42489c2361d6f9dce8bf5bf0e9f40cc34' 
  AND token = 'YTjwWhhztpnugmqu486DKYmpT/Oh8Va3empKn4x80nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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