Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5189b19bc4487cfa3a0ccbf4434e2e6df1e27db67ebd46d20f352eaa63b65596' 
  AND token = 'L1Xs7n5Ldht8dhu01t4k02Pgtshj66wfTWWjPfFeZqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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