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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '39f7975bb6716afc590635e7e25c3b48d701bded20c5c71b43cf761fe7e046ce' 
  AND token = 'mV2vjmPNxoIOkOXYjG+DFCWiUF5NOXcvPx4i9etlNpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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