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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '97a53be057a3257078cba4a7e774f75f94a23e1f339ca1db6bc06d48dfc9bbce' 
  AND token = 'LTzshchLnWFqMb9UpTXD++h7e73eimPJjvjt62sLNnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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