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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a870828558bc8e169a8dab89baeeb73df41c1bd2e235f8724c94285eefba6715' 
  AND token = 'SNIy9Jak4ixdtFKcL9fFxUdhKl7rg3AzwKgE2023MVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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