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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '239c101fd4e70470a956fa62ab99ae08a20e27eefe2272467a3d21474b9d47e3' 
  AND token = '7uaq+0nh3jhaVUaE2HGzTxuyCfHmN5/Itp0RCuMpH5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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