Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82759b68c0b5d0077c7880e92faf6d624016c758e1535c2854c318c4a2e1b9a' 
  AND token = 'F6AqbNkbRMyUs7lBWEYGc2kKWBsowzMM4V2P4MZzV3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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