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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0c3073eeb51337ea5752306284adc6ec35d381985affe6786eef76218ba6b5af' 
  AND token = 'R1364FbEm5+/CvcHzR916Ki++i15/qURfTAlKkeJsfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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