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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6c70dc284a3b5e5f4a322ea4e4974c45ca418247ac8a970ec43dbc4f4131ae79' 
  AND token = 'em2RYkVe8sLxyEW0ucpVPjkmdm3ZXbABPwQYclqkB/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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