Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc659d70fe3ea871aeee1fc806c11f99909a6ab29e604b5c75984e4ad0cee40' 
  AND token = 'Jr/ifs5KpQgLDoCVMEOnb23ImIWERn1UU2besfz/75A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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