Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3512f8fa89dcec8f43a14c86a036e8d461860a7f9abf0cddcd5096931a2c2f3' 
  AND token = 'heoAEYLNNZEuMRy9MFiuzffWTTNbv3n4ZPr2PB6OXkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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