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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e3914f54dae465a118e68552a1469760cf0ed407a0f80e778f946a0ecc050100' 
  AND token = 'gMQJR524G429FZYL5IwF18MwreUj8QxE5U/ef264tbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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