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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e990010bdc333250bf35ce395d7e7665db4a973bff9741a1c9a0fbbf1c0f1459' 
  AND token = 'G/NgpnV94NUMAfGcIrYBEylq2JU+9JrpdTko0XEsSlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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