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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '03be09da4116dbeedcf10362be8df0e3759dbe41f8c3d661f7b84dcc55ec78c9' 
  AND token = 'KmdNMPsQlb/rGTuNdtFIWcv5Cjp5t17tBY1U6iBDOos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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