SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1ffcd633e0b1494111aeea89254d09488d7052d24070bd9bdd5d7d1843586b33' 
  AND token = 'KNqHaxxUzgS9ZaHG2JxL8+jWRv1i5N8cNEScNtVFRYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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