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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '00a0c9b1a2be4470c72952a7222ed295c7268c048b5d09961ca9381d7528b381' 
  AND token = 'EVNn8GIh/j0Z2onNbWJ5Nc6Zet9rc4BJHjcuTKHmNB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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