Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9349676e2e2105d7cb69877c903f0cfddcc195af83bf858a371b2781baf37486' 
  AND token = 'JmdSdSVcUinkdgSu3vbjWK3qN9ON043eaRdsN7fjgT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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