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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c0877c0693bbd9ffbecb95571bcf5c24a2fb34020b25837b9dcedd4beb0c431b' 
  AND token = '2ennr7Xb6H052htmUkScAerJHPpsUg3s0hQF5Ejeh6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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