Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ce9b7a22d30266502b742a7c5faa00a21112bd0a8fe84d6cb9d88b58d83ce7' 
  AND token = 'mRp3MBsx3/eepu77ix86d1vy4wrLTNETwLq2Hf/b88A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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