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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '10fe5d3ad3f0e20e6a36734b79254b230e589982bbeae8e19365bf99089da0bf' 
  AND token = 'RWvF39WO8pa/yNNzsD2qsffB9pq4tMF6v+rDs2/DhsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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