Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a6fe3e96b77c878c466e6755769a6d381593ebeb43ebf728037f7306b5ea42' 
  AND token = 'm2PkTGFFHR8qovhqLwUiCVST55xQ1NLLGX7pCQqaiYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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