Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a1081a04edd1bdb6e579ce6ffadb8f6198ffe78c5739b2eb9ed38a1fc47985' 
  AND token = 'dWLMfAZ+FBw1sfMF3iACk+gA/8j1/Jx1tEhK1j4SRzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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