Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a00319b0f8d7b7830e2ccb72316f1ae8926d1468e3c49124b100620abd520d' 
  AND token = 'fem44iAKmvWjBF57BWziSxfsnQL8EcL6oy72+fPSigg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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