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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '24bd40944d26c3def6cabe02456dbdd1bfa13cd5eccdf92369fdca6f8b7759d0' 
  AND token = 'RLDhd6ZdoLmzdqBwBauz67F6UsE9IqDY9kf/iORhh7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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