Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b586d38f3e37d38a16e9ffef82464834d998e5d7da517de6db1998628785bf' 
  AND token = '3+wDggT4OXbITWabZw2ktD+QoNcq2DyPpB4JCkA2oSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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