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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8634298b976140e7d98ef2abd7cfa2b18d1b825ce8664334b519ec137a1170d2' 
  AND token = 'y8qNStpUe0TBDO/9FaW14D5N4kDyQHIWHF9fDneXC54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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