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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '71d61b680534ac18986fbf97caa3850e9d2ceb23101d931069eefd0d187ca233' 
  AND token = '4kFoStyS/71cunDPzTPeJtH8mo6wRysXGtz9gXu8wYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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