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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9b3b2f76b52a99631b746da919a60014b2f8149b3ccfa5b8e45fe2c0ebb5488c' 
  AND token = 'DVusUF03kLQLwDTEFJGFrK4wasksjrHzp6D1mdboupw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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