Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aec96f1f8725969e2b43fcdaa5b26adee244a1fcd2f5e5c6c6f43af6b219fbb' 
  AND token = 'MG3P2lConb8VkYPI7lLVNxBE7TkLYfgevFsltDdSRhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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