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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '64d29b9a90bf635a0dcf40f5a97ec69e9145a2aec5c1861f46c28c54cc89a1a2' 
  AND token = 'dfwVNFUBXwttHr7mE+tPtSZM+2AYaaZtrz6O1HEypjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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