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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd42d80f57f61e7a5a2c2c324bc01c9cbe73ab452181d9b2f658b166c15ecbe45' 
  AND token = 'vlwBHbuQ0ZdTW7+WGmWsqa38RQaowAdicdSRkP1+1tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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