Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2c3fb22a8dc538218c4b90f6ad569034f9e2ed5610d61034bade31ea33fd19' 
  AND token = 'wpZUeoJfoEd4BtwjQBM2p6h79FeLzIHTLO5s+PPi92Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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