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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '84fafa8a9c3edd5335c0ef7f6784bc19993ba5e3f51da8fde0994da4eba391d8' 
  AND token = 'HeuutJxSXj9BPG7HJV/mA7hekh7LZTBh0ykvWCRxVMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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