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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9c1ce168cdb222a9a8bbad286fb56f6c35dea6d70b018a4fcf22b61936e3b036' 
  AND token = 'Dtylc/y+E23WxGpFnNmgo248rxbDVMRrJmwkPGwzIwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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