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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '36f0ef61d4818030971da78e21796f369f09846ef18ab0518562d611c18a3376' 
  AND token = 'g3uIZFnZrVfC2glkeOWOywFhNs7WWflvoG1O4MCY9eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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