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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '20a208f284930dbc3456279998422d1be4d9ddc9be92ea91b0b1c9605ebc5c09' 
  AND token = 'LL1yzIWbj8cV+ARw0s24xDCuE2byVqv1AvD7UB/ofMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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