Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1222b16f98453944243788f2efe419a464b68b760bf7e04d73276653b87105' 
  AND token = 'vKeBNrB1ZN2Ycmc+Qlr1GMKv7kKTdEwum06zEfWihzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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