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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0475bbd7df33302bf060bac871fe21a39fd35144c2df72c3eda2f7996569cc54' 
  AND token = '20cTX3sweNigveyj7Z7Ljm+xnA97XxnUlcwwfgDCRx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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