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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b2761d6c435780ef581f5ac8255a0f807f1612c658cb22d179f25e312730b2d5' 
  AND token = '4SZdIoxt/29AbY/lkkQzzC3rpj991xz1ZfP/eGucNyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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