Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e3a36d6e8afab13c529e579fc435547cad0b0a424af7728c65c890fefd9192' 
  AND token = 'zjn7jWHCtK08LS+advLpsY42+PIo2z1criGaJWUXI24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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