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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1429acc5d5b2af6726f1184c028b0626cae48ffa48cfec5f3aff2e1fc0473679' 
  AND token = 'Goz8pekib5RuwiG9SkLjFrMRjGuM0w/tgv2V+uBncN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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