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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ae099e63e170c7aabaecea65079376a7258d6b9b19e3ab67f84cdca7196dc87e' 
  AND token = 'nlqb5OnUxqEGP2g4FKDv8hMElG1d1WOBdrIwdmAKp7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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