Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a668f523e7c1a3148d83e103be588cbec377ab443b0ff70073cf44eefa0bcf6' 
  AND token = '3SxnvR5qkhQfmvBKhVWLMXFmK9BfsxmdaP5q2l5WDFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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