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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cbc25103c5a5252665bbf389888e1a167afc65a820a95f5a5da16732047fdb85' 
  AND token = 'WyCoOwGx6TnsUZ4gs4Cp/siSZ1u7HymPpyq/Wsa6IEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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