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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '166ad3986f0049ae3d8b02b8b56df93e1d48e33a2bb4af0a7c8b4e625248535c' 
  AND token = '1QyfmThoUpm0y3+kK18ylHprLwR4aif7FnlH9mXM6HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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