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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dafacf1b155e7c607f95a45292f7edaffde15aead212624b6d673351d4da497d' 
  AND token = 'Rjm5UzodakwPxrXEWkvz5K4qfLVM9Ku7V9oOwVmTee8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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