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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '89f408f0d1b414533c6d435284d5903ae529e7aa68ef8b503980711acd3288de' 
  AND token = 'dev6QlpTROXp64cXvtifcG1maazbUxqkON7My+p+VJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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