Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da73a3c56930ee8b2aca400f585eade7540b09a928cef9b6e610d1de99bad8fc' 
  AND token = 'vIj+i2EjmawGDW9PcS2RclRnE/rlHuSBKmv3Ln6f4xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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