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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '92b4d6367e1177d7ccec2587d1eaa2d51ed1b7c6d44420986dc1338d827b3e4c' 
  AND token = 'gIK1mCKABAbMVm/KCnjGcw+IoW9dyAKAy/bkUjIzPHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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