Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cda281665543ce87f6a7b19474d878022a1af19078c2437cd6437847cafdf41' 
  AND token = 'MI26VO/3w31RivHJL6sWWCikjqx92olZAt0FiqxHyYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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