Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b74984d9e6b02951d87e34e231bc8f4682da85ccf3ea54f2c5af1217f652817' 
  AND token = '3BAlzztMdUoE5+xfnU9I1FDkKsdI0lYTTemhoehsScc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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