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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '641d357df94ebdd85633ba2fc6251b355825157ab0b4f032c808950ce766eff8' 
  AND token = 'E83W7mImgICio+i0pm1Iyu63kUt8A1Lmq9F9uqsacSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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