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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '50e736a2312f02819978814d9d28cf618716a1b7e85a2e3cb00af7a1ee6d4c55' 
  AND token = 'bgfW8c2aEKCTOovpsWimeJ+E6MRveR43Gjljv0re3jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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