SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '439f030695709810949aaeb1dc4d95cf04159e55617737cb32e33d6bd58e2a80' 
  AND token = '82hSgIsziszA1OlfLnormrjJG0fKW6Yw8VeuKqxwinE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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