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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '172c41a26b271040f5e4e6c4d70f0e8afcd5f0ebb04592d778ccefeb6f337b25' 
  AND token = 'ZQoOF0WgSNL9kFuQuwwG7TJ5fef8UkONUksM33AiPDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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