Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20cf2ae9ae00e6bc1ab31575713b9fded7877eb558b2ab4694fb312d76c4aab' 
  AND token = 'TyZtk22z9QsAbO/VrlqJnoUyN8x5kdz4wkm2NAMk1VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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