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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a5671327081050b61ea2bb71a6f8a8d347093dba88fc38f36231ea725d750c0e' 
  AND token = '/aafEJf7SOKMMvHYEHaxLjxKxbgHlWHLuzoZ1OfLRqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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