Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82cb2fdbd4303027ca9204f60c49e812c6a27923310e40e3eaf3d4df764fd188' 
  AND token = 'xkQDfvXV32Ej7mED8q4LQeqstbbQdsmL+MG6xcP9JNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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