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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a4db88d6bf5d113969f6ecc2143a905f7cd4a84924d8f770bb6f774944453c1c' 
  AND token = '1v9s62WbKZCAmzx4wXPwIK2xxGopyuT/qcdPdKE2Gr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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