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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aacb3f66bffb59b2c4333017298ebe1473d2f8d6de75c20255d10459d00f53cf' 
  AND token = '6I9w2uhc0OxNJr0nxF2e8d8X6sGqyawVPWra4D05wTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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