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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5544c35a27eeeb5f3e194db39b94e90ba3ddd77b986607134da7622c109943bf' 
  AND token = 'AXNETmn2DMtiIw704bnyKracaXy1ITh8Gq0284o+MkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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