SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5028264c2dd23e6eb8fd29efbf5f85ccf040c8b1f45600633d6716a6408332b2' 
  AND token = 'LJyGKphMZjQxJtJiJZa1lNoYEdg9H1NKP5XcltahCzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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