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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '482a93a58dc55ca79888df1634382c87eb3f5de8bcee6e7e23f8a8fe31d361eb' 
  AND token = 'YCCx9OK8q9+n/QcgmNA97oHiX/Wb0MP8tnBdvibrrYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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