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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e22c78049ef8099fcafe07d8f12132ec671f8eac6da7d9b72f80f0714bdda9d3' 
  AND token = 'qUPnhpuo73i7qeOCZNy6ENbgjLZoBncsrsQXE0q68ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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