Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9ec3ae9fc1adc0a4adc2147f4b80e6a45244132968e1f9b1d6eeb1e3b87052' 
  AND token = 'FL29kkWI+Zomk4JQAu6ODk0WFeEL/OK6v0IIkWaUDmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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