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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cfd7a834dd62391f412f55b5e9471aa6f7d17822efbd7e06c51a8ef594e1d54c' 
  AND token = '+oIpgHaAkEoxuY+lkSQoB5VJKlMbqJa+QsbX+DplTgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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