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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a2306cf60fa5d20c278e7380d78e743fdbf8a14935eb040535ea1c5dfca4096f' 
  AND token = 'GoGOmudanmNoWIG2+avuR28ZrH8Td3tTEFooBRa/Cm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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