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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '91d9cc42cefae3c8f762c8d033410c96610b265204630b771e5805b89f9e16e4' 
  AND token = 'T24n9vbRPtr4k+nKcF2fW7tvRTE2MrtMcjCFT5tQrMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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