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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '265cbc9c14cecdb9437fbfb0584d7f6040c53a63e82ce49e0160a4d1d8a100eb' 
  AND token = 'Ukcj+BDEXnyJeQsLVwwZZ3sdOx0r9ZjN9/Ib0f1lPjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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