Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c19c3297b32743bc4c92c9afdfb20130701e43ee7e3fd1f88aef1678b5ac32' 
  AND token = '20Y9nvawiwEcpRCK+WUIujWrf/9vIONLN9SReEQ/z3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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