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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b509bebfc762c1523a80ad9da6da093df8ec18f80c4fdafe6ae48c5a94dd1bcc' 
  AND token = 'j5hbBw0cN9PlB/rfYxH5v7sF5X5dgxccmpmYsS9Cgx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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