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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '96c9d2eba8aa800e2c9440019f1df2c7fa5686c6ea2a768bd0deca8ebd83099f' 
  AND token = 'swZfVd8N8JumGmieWrDBn4mxB/KZEJUtaklbb5zZLAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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