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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7fd5e94f8cfe21639eb5026a2ddc28efc578dd4d9b68abc1c2b0a342ffdcef3f' 
  AND token = 'kow/6gDP5V9Oj5nF9k8kIoxrbKE/cotrZvDQ05SLrLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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