Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd31ec36d39cb984b5b1f8015e1dc897d0e04c4f8ae8e2cf73ea567f46b2ee7' 
  AND token = 'X55tiURq1yWKcYG5tjHck+A+NorQ/qSLO5rOhh/I7Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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