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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '72d47ecd4deeb26453d679d19be8fb1328dd9f2807afb08874e3096c696cc4c8' 
  AND token = 'J4M8Wqtt8SNM7agLyQx4d80qI2E/stHNkAe00PLhKCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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