Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45ca966c18236e1bbe4dbef41882e50f5496cf1aaf72a1d5ecee171685c1bcd6' 
  AND token = '6uvnoT5FwzSz/PZcKTIwdMJ+dLDy5bnxtytPl6umm10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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