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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1ee8b1c6ea2d4f51b138198de6414a10fa1dd81c5c3f2dd26f930e9edd38bfc6' 
  AND token = 'LHmAW4IMc1N1BH1Woxtn0lHxri1Si4t/QuTDlkXs/is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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