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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '24af18a1edb772cb8c287ad034b95aedc749ff833e2b683cb933a00a9e3be700' 
  AND token = '4yT/2oYndfl6Zq5sHzHlg/UN9ies4/spY9F+9EfJJzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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