Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95f82ba8b7dee0edaace0f0cf2defde2e039dde03b9c3cdd7c9b18d8f20076f' 
  AND token = 'nkLlN5vhX4G9Xk/Vayb22jYQC51ZmFDsBd//kBA9/eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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