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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '194c423df44825e219be316c5b9c33d6772f67d375ac60aa7d59d012c07bad04' 
  AND token = 'iWF9sZ5cUNlcEumIh7l4ElYeBe7HHqLQv4P4EpTC0Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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