Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa89b79803e29bed0e125af1139c6917d3504137a0b8a5cc5e55bad867da3a75' 
  AND token = 'gHKjkaRHVy2Whu6UfgcuGTIvGhyxLkeOoLq/9xiQ2mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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