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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9bbfcaaee63f37d48abf1e4bac202a06341c1231fe413815dff8dac125fa8ac1' 
  AND token = 'sBZ1L4E5Da7/xvZxG5au46V39X14IM3HxzguZqkOw9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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