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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e045d9e6af702d4054ec912ba8550af9fb7fe3b17cb2dbf1370eb38ad8cb3d4e' 
  AND token = 'JNlKQOlTbFxYHtQTnJqXfIvBfheZs2BbjSoj72ZI6Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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