Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b3e666898ff4c451dfd15a690500f7a2db4d7e6e3675aed870c48bf7a517bc' 
  AND token = '7sawPOU8ohJ/26uzBsSXEIuN1DuuoDHSCN8T4zXuBPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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