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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1c9f2b815ae0b145899f49b2c6926f5047be6b4cc0f63e860c549ede2431e6cf' 
  AND token = 'oVW7nEdNVwkvaZ1SMd5N3lol92qS9V00r0q+sK8u624=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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