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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e59758887e1afb6871824d04e5e4c882c38f452ea0f785804f0b113d16a00b04' 
  AND token = 'U+POwP+y83K4PyTwRlzIJtng/ldtUvocGDokMzzUP+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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