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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '13f60e412264a1169ba06834aca87ce09a4ff1b93c10b7876d792f2139088473' 
  AND token = 'H3I6VWGPqC0v8JTmj4I2Ch6xn18RiXyO1YqbAQXc/DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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