Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d94fea53802352e2f7812c316286d5473f2051d7cdea58d4597e42fc990b03c' 
  AND token = 'dkyrcwRhK+Lr+DdnjRa3rbZeXdS5a3sMZyeRCKIU/eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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