Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe3efd5b9adf7a54b02f3c859d1a23802d534570aaa731dc01f9e27194bc6a1' 
  AND token = 'jdga6PC1mBceq2ZjNBKNO8Z5EmU/qJjy2SPCXyGb1qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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