Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b90e08a33dbd39e7ff5af1ecfdc7616d378cc0d5ce1f798c390469efbda2021' 
  AND token = 'D6slt7Ipfdng5IenHgc4RuYIAfRYf9zzuHcTbAbX/Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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