Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5bf2261d03835085f9391681b21a8b4747fd60505ffb2ced41ce886cd1a9886' 
  AND token = 'HFu4Xlrw8tZKXikQE07LdaIruMFUEHQWLCxxpQkD1Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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