Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b78ee4abe3f708652c994430222a33c23f1a365e2c512689501ec66f293b3e' 
  AND token = '2TFcfKabgzhbXpLVyDCnE1eygc4we7iEWrSnB4n6XX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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