Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1c5e8c047170d88aa0bd1a3a2dd2cbde163b07a86e8800e923ff2165937f0b' 
  AND token = 'MVesPr8GBaMoaLq2OW8Vs8n7V/kNY5i9GifzZfzcUhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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