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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2d8f31f971893919ae99b0194626643271bcfbf372cff18fe92c27dbefdff5e9' 
  AND token = 'a05Cn/qSWj9LY+4/vMiltlHOE/Onpbmdy0Qso9h9agA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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