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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ae3eede2d6448ab66ab55fbdfd68a6535ee747e65050ef09b2b48519c476292d' 
  AND token = '4XmVZfv+GJ0aW5q+wtd2z5CAv84+qW8HzoI7nEuInSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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