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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '17c08d7faaa2e17c837fdd6618dc6496c35f4832f1f641738957014201a9dbac' 
  AND token = 'VdeyXtZSYyEHuEJ7LozVUkn1XkgZkG8VJGHpf6a8iT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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