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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6fcc9674c83547f627effcbcbfdd9a7d9ac227b19b5aa25cffe75bc530774519' 
  AND token = 'J6aawh9jtukAMLcow53DNZieXuGRiVtUs8ecQpD+kYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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