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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ecb0526b4c03d46f32d0126dbce80ff77fe659d3caf24fad3462a0984ece8cf3' 
  AND token = 'Z1D+KD14IDsFRmTBX8hTxGd9BES6hszAUur3UOczSFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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