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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a36b01849b6de358f8c17c794e692eef29ff74c9e026f29f4564b8c183b6b5cc' 
  AND token = 'YmHXuERIxtDqWjny/zHXn1QOXDkSMEpE17mvcSB1dPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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